As a child, Stacy discovered the theater and prepared for his dream by study acting, dancing and classical training in voice and singing. He earned degrees in both Theater and Film from James Madison University.

He had featured and supporting roles in the television series Passions (2004), Love, Inc. (2005), The King of Queens (2005), Joey (2005), The O.C. (2006, with Melinda Clarke and Michael Nouri), Weeds (2006, with Ron Canada and Andy Milder), and Help Me Help You (2006). He also performed in several stage plays and music videos for artists such as System Of A Down.

Further acting work includes the short comedy MyShadow (2011), the horror thriller Rabid Love (2011) on which he also worked as co-producer, the horror film The Penny Dreadful Picture Show (2013, with Jeffrey Combs and Sid Haig), the crime thriller American Girls (2013), the drama Guardian Angel (2014), and guest roles in episodes of NCIS: New Orleans (2014, starring Scott Bakula and Zoe McLellan) and American Horror Story (2014).

More recently, Stacy worked on the science fiction reboot Terminator Genisys (2015, produced by David Ellison, Dana Goldberg and Paul Schwake through Bad Robot), the action film The Lost Girls (2015), the drama The Big Short (2016), the science fiction series Blade of Honor (2015, starring Tim Russ and produced by Ryan T. Husk), and on episodes of Zoo (2015, with Billy Burke and Wayne Péré) and Underground (2016). Stacy also guest starred in History Channel's remake of Roots (2016, with LeVar Burton).